diff options
Diffstat (limited to 'android/guava/src/com/google/common/base/AbstractIterator.java')
-rw-r--r-- | android/guava/src/com/google/common/base/AbstractIterator.java | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/android/guava/src/com/google/common/base/AbstractIterator.java b/android/guava/src/com/google/common/base/AbstractIterator.java deleted file mode 100644 index aaeb5f0d8..000000000 --- a/android/guava/src/com/google/common/base/AbstractIterator.java +++ /dev/null @@ -1,91 +0,0 @@ -/* - * Copyright (C) 2007 The Guava Authors - * - * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except - * in compliance with the License. You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software distributed under the License - * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express - * or implied. See the License for the specific language governing permissions and limitations under - * the License. - */ - -package com.google.common.base; - -import static com.google.common.base.Preconditions.checkState; - -import com.google.common.annotations.GwtCompatible; -import com.google.errorprone.annotations.CanIgnoreReturnValue; -import java.util.Iterator; -import java.util.NoSuchElementException; -import org.checkerframework.checker.nullness.compatqual.NullableDecl; - -/** - * Note this class is a copy of {@link com.google.common.collect.AbstractIterator} (for dependency - * reasons). - */ -@GwtCompatible -abstract class AbstractIterator<T> implements Iterator<T> { - private State state = State.NOT_READY; - - protected AbstractIterator() {} - - private enum State { - READY, - NOT_READY, - DONE, - FAILED, - } - - @NullableDecl private T next; - - protected abstract T computeNext(); - - @CanIgnoreReturnValue - @NullableDecl - protected final T endOfData() { - state = State.DONE; - return null; - } - - @Override - public final boolean hasNext() { - checkState(state != State.FAILED); - switch (state) { - case READY: - return true; - case DONE: - return false; - default: - } - return tryToComputeNext(); - } - - private boolean tryToComputeNext() { - state = State.FAILED; // temporary pessimism - next = computeNext(); - if (state != State.DONE) { - state = State.READY; - return true; - } - return false; - } - - @Override - public final T next() { - if (!hasNext()) { - throw new NoSuchElementException(); - } - state = State.NOT_READY; - T result = next; - next = null; - return result; - } - - @Override - public final void remove() { - throw new UnsupportedOperationException(); - } -} |